7.5 Next generation instruments

Next generation instruments will operate at higher frequencies, and need higher bandwidths, and better angular resolution. The major changes expected are:

• Use of optical fibers rather than cables. Actually this is already the case in some interferometers.
• Digitize higher in the signal chain. transporting digital signals require more bandwidth but is more accurate.
• Possibly generate LO signals using infrared lasers rather than by multiplying lower frequency signals.